art. I. On the circulation of sap in plants, by H. Hoffmann.--art. II. Upon the male of Argonauta argo and the hectocotyli, by H. Müller.--art. III. A few remarks upon hectocotylus, by C.T. von Siebold.--art. IV. Investigation of the question: does cellulose form the basis of all vegetable membranes? By H. von Mohl.--art. V. Memoir upon the hectocotyli and the males of certain cephalopods, by J.B. Verany and C. Vogt.--art. VI. Organographical observations on certain epigynous monocotyledons, by H. Crüger.--art. VII. Fragments relating to philosophical zoology, selected from the works of K.E. von Baer.--art. VIII. On the development of Zostera, by W. Hofmeister.--art. IX. On the winding of leaves, by M. Wichura.--art. X. On the development of the ascidians, by A. Krohn.--art. XI. Observations on the development of the Pectinibranchiata, by [J.] Koren and [D.C.] Danielssen

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